What is the usage of count function in php

The usage of the count function in php is: [count(array,mode);], where the parameter array specifies the array to be counted, and the parameter mode specifies the mode of the function.

The operating environment of this article: windows10 system, php 7, thinkpad t480 computer.

The count() function in PHP is used to return the number of elements in an array. Its syntax is as follows:

count(array,mode);

Let’s take a look at its parameters:

array is a required parameter, specifying the array to be counted; mode is an optional parameter, specifying the mode of the function, possible values: 0 - default, do not count all elements in the multidimensional array; 1 - recursively count the number of elements in the array ( Count all elements in a multidimensional array).

Let’s learn how to use the count() function through an example:

Recursively calculate the number of elements in the array:

array ( "XC60", "XC90" ), "BMW"=>array ( "X3", "X5" ), "Toyota"=>array ( "Highlander" ) ); echo "Normal count: " . count($cars)."
"; echo "Recursive count: " . count($cars,1); ?>

The operation results are as follows:

Normal count: 3 Recursive count: 8

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